Inaugural ASAS–CAAV Asia Pacif ic Rim Conference Abstracts

Production, Management and the Environment PostersT297 Study of a reverse-season reproduction technique inT299 Effect of lighting schedule on growth performance,liver breeding geese. B. W. Wang* 1 , W. H. Ge 1 , M. A. Zhang 1 , H. Y. Guo 2 ,and B. Yue 1 , 1 High Quality Waterfowl Research Institute, Qingdao AgriculturalUniversity, Qingdao, Shandong Province, China, 2 Yinhe-Runyan Co. Ltd.,carcass traits, and meat quality in broiler chickens. W. Li*, Y. Guo, R.Wang, Y. He, and D. Su, Faculty of Animal Science and Technology, GansuAgricultural University, Lanzhou, China.Gaomi, Shandong Province, China.This study aimed to overcome seasonal limitations in the reproduction of liverbreeding geese to allow goslings and commercial meat geese to be supplied tothe market throughout the year. The experiment showed that covering the light inthe goose house, controlling the illumination time, limiting the rearing program,and plucking feathers manually were able to change the conventional seasonalreproduction mode of breeding geese and realize reproduction in the reverseseason. The hidden pathogen design of the goose requires that shading andtemperature be controlled effectively. Geese 1 wk of age should be illuminatedfor 23 h, those 2 wk of age should be illuminated for 18 h, those 3 wk of ageshould be illuminated for 16 h, those 4 to 13 wk of age should be providedwith natural illumination, and those 14 to 30 wk of age should be maintained indiurnal illumination for a total of 8 h. After 31 wk, the daily lighting scheduleshould be increased by 20 min until reaching 12 h/d on the basis of an 8-hrearing stage. Goose poults 1 to 4 wk of age should be supplied with enoughfeed, and for geese 5 to 26 wk of age the proportion of roughage or green foddershould be increased. After 26 wk, concentrate should be added gradually (atleast 10 g/wk), and a peak amount of feedstock should be reached at 29 wk.Roughage or green fodder can be added as appropriate during the laying period.The proportion of roughage or green fodder must be added at the prophase ofmolting, and the proportion of concentrate should be added at the latter stage.The measures of controlling feeding, changing the illumination procedures, andplucking the main wing feathers manually were used for artificial molt. Theseschemes should be carried out strictly during brooding, the rearing stage, andthe laying period. The germplasm characteristics, therefore, would be able toadapt to the living environment, and the internal environment of the organismand the external environment would remain at the same stage.Key Words: liver breeding goose, reproduction, reverse seasonAn experiment was conducted to evaluate the effect of 4 lighting programs ongrowth performance, carcass traits, and meat quality in broiler chickens. A totalof 288 Arbor Acres 1-d-old male chickens were used. Four lighting scheduleswere continuous: 23 h light (L):1 h darkness (D), 20L:4D (12L:2D:8L:2D),16L:8D (12L:3D:2L:3D:2L:2D), and 12L:12D (9L:3D:1L:3D:1L:3D:1L:3D).Feed consumption was recorded daily on a per-cage basis. Body weights ofbirds were measured individually on a weekly basis. Feed conversion rate wascalculated at 7, 14, 21, 28, 35, and 42 d. At 42 d of age, 2 chickens from eachreplicate were randomly selected and slaughtered after a 12-h feed withdrawal.Carcasses were weighed. Abdominal fat consisted of fat surrounding thegizzard and proventriculus. Each carcass was cut into its component parts(breast muscle, legs, leg muscle, and wings) and weighed. Meat quality wasmeasured with pectoralis major muscles. The pH value was measured 45 minpostmortem in the right pectoralis major with a portable pH meter. Rate ofmoisture loss was estimated by the method of Wierbicki and Deatherage (1958).The concentrations of malondialdehyde in breast muscle were assayed withkits purchased from Nanjing Jiancheng Insititute of Bioengineering (Nanjing,Jiangsu, China). Dry matter, fat, and CP content were analyzed according tothe AOAC (1990). The data were analyzed by 1-way ANOVA using the GLMprocedure of SPSS, version 10.0 (1995). Significance was designated as P